Just a personal anecdote, but miss-timing your button-press sometimes results in a car-wash being added to your pump charge.

I was trying to hit skip or cancel or something (this was in the Before Times, barely remember what it was asking) and what was the skip button became the "Yes, I'd like a car wash" button as the next ad started. I always suspected this was a bit of Dark UI level trickery, but could also have just been unfortunate button selection between two separate ads.

Since then, I just avoid those buttons when ads are playing lest they get me again!